[PATCH 1/3] mmc: sdhci: Add HS400 Enhanced Strobe support

[Jaehoon Chung]

On 11/1/21 6:07 PM, Alper Nebi Yasak wrote:
> Delegate setting the Enhanced Strobe configuration to individual drivers
> if they set a function for it. Return -ENOTSUPP if they do not, like
> what the MMC uclass does.
> 
> Signed-off-by: Alper Nebi Yasak <alpernebiyasak at gmail.com>

Reviewed-by: Jaehoon Chung <jh80.chung at samsung.com>

Best Regards,
Jaehoon Chung

> ---
> 
>  drivers/mmc/sdhci.c | 18 ++++++++++++++++++
>  include/sdhci.h     |  1 +
>  2 files changed, 19 insertions(+)
> 
> diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
> index 766e4a6b0c5e..bf989a594f7e 100644
> --- a/drivers/mmc/sdhci.c
> +++ b/drivers/mmc/sdhci.c
> @@ -513,6 +513,7 @@ void sdhci_set_uhs_timing(struct sdhci_host *host)
>  		reg |= SDHCI_CTRL_UHS_SDR104;
>  		break;
>  	case MMC_HS_400:
> +	case MMC_HS_400_ES:
>  		reg |= SDHCI_CTRL_HS400;
>  		break;
>  	default:
> @@ -666,6 +667,7 @@ static int sdhci_set_ios(struct mmc *mmc)
>  		    mmc->selected_mode == MMC_DDR_52 ||
>  		    mmc->selected_mode == MMC_HS_200 ||
>  		    mmc->selected_mode == MMC_HS_400 ||
> +		    mmc->selected_mode == MMC_HS_400_ES ||
>  		    mmc->selected_mode == UHS_SDR25 ||
>  		    mmc->selected_mode == UHS_SDR50 ||
>  		    mmc->selected_mode == UHS_SDR104 ||
> @@ -799,6 +801,19 @@ static int sdhci_wait_dat0(struct udevice *dev, int state,
>  	return -ETIMEDOUT;
>  }
>  
> +#if CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT)
> +static int sdhci_set_enhanced_strobe(struct udevice *dev)
> +{
> +	struct mmc *mmc = mmc_get_mmc_dev(dev);
> +	struct sdhci_host *host = mmc->priv;
> +
> +	if (host->ops && host->ops->set_enhanced_strobe)
> +		return host->ops->set_enhanced_strobe(host);
> +
> +	return -ENOTSUPP;
> +}
> +#endif
> +
>  const struct dm_mmc_ops sdhci_ops = {
>  	.send_cmd	= sdhci_send_command,
>  	.set_ios	= sdhci_set_ios,
> @@ -808,6 +823,9 @@ const struct dm_mmc_ops sdhci_ops = {
>  	.execute_tuning	= sdhci_execute_tuning,
>  #endif
>  	.wait_dat0	= sdhci_wait_dat0,
> +#if CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT)
> +	.set_enhanced_strobe = sdhci_set_enhanced_strobe,
> +#endif
>  };
>  #else
>  static const struct mmc_ops sdhci_ops = {
> diff --git a/include/sdhci.h b/include/sdhci.h
> index c718dd7206c1..7a65fdf95d30 100644
> --- a/include/sdhci.h
> +++ b/include/sdhci.h
> @@ -272,6 +272,7 @@ struct sdhci_ops {
>  	int (*platform_execute_tuning)(struct mmc *host, u8 opcode);
>  	int (*set_delay)(struct sdhci_host *host);
>  	int	(*deferred_probe)(struct sdhci_host *host);
> +	int	(*set_enhanced_strobe)(struct sdhci_host *host);
>  };
>  
>  #define ADMA_MAX_LEN	65532
>